It's a warm evening at Tia Chucha's Bookstore in Sylmar, in California's San Fernando Valley, not far from the neighborhood where Ritchie Valens created a rock 'n' roll version of the most famous son jarocho tune "La Bamba." Tonight, Aaron Castellanos is one of eight students in a music class held at the store. He's learning to play the eight-string jarana, the main instrument in the musical style of son jarocho.

"I like the way that the jarana sounds," he says. "I like how son jarocho invokes so much energy into the playing and into the singing."

Son jarocho comes from Veracruz, a state in the Gulf Coast region of Mexico, where three different cultures — Spanish, indigenous and African — came together more than 500 years ago. Castellanos is actually learning the "mosquito," one of the smallest jaranas, which has a noticeably high pitch.

"This is the first instrument that I've ever learned, so I want to keep playing," Castellanos says. "I want to buy my own jarana and just continue practicing."

Castellanos' teacher is Cesar Castro, a key figure at the center of the Son Jarocho explosion in Los Angeles. Castro says that, since he moved to L.A. from Veracruz eight years ago, the number of son jarocho musicians has been growing, and the quality of the music has been improving.

"When we had the first fandangos here in Los Angeles, the music was not that good. But the energy, the will to do these fandangos, it was very strong," Castro says. "The music is getting better, still in a very respectful traditional format."

Fandangos are at the heart of son jarocho. They're kind of like jam sessions, where musicians gather to play, sing and dance around a wooden platform called a tarima. At the Zona Rosa Café in Pasadena, the fandango is hosted by Castro's band Cambalache, one of a dozen son jarocho groups in the L.A. area. Within an hour, more fandangueros arrive and join in, playing, singing and dancing.

About 10 years ago, Castro says, young Mexican-Americans got into son jarocho as a way to connect to their Mexican heritage.

"They felt more comfortable, more invited to participate," he says. "It doesn't matter if you don't dance, if you don't play, if you don't sing — you could be around it. It's a whole experience that people, little by little, got the chance to be part of and feel something good."

One of the groups that grew out of this evolving scene is the primarily female Son del Centro, an ensemble created at the Mexican Cultural Center in Santa Ana, the heart of the Mexican-American community in Orange County. All of the members sing, dance and play instruments. Member Ana Urzua says the music's ability to get everybody — musicians and audiences — to do everything is part of its appeal.

"It's a beautiful music," she says. "It's a music that is welcoming. But I think it's also that it is a part of something bigger. It's a part of a people, their traditions and their culture."

Los Angeles has been hosting a son jarocho festival for the last 10 years. This year, Mono Blanco, the group that helped revive this music in the late '70s in Veracruz, came to play in South L.A. Gilberto Gutierrez, the group's leader, says the traditional way of playing son jarocho has not changed. What's new and exciting is how young Latinos in the U.S. have taken up the music.

"The fandango celebration has the ability to bring together families, generations, different social classes ... and that's really positive," Gutierrez says. "Especially because these days, different generations tend to separate, but now suddenly there's an activity that unites the family: youth, old, kids, rich or poor and so on. I think that's what's been attractive to people here in the U.S."

Rafael Figueroa, a writer and radio host from Veracruz, agrees. He's been recording and documenting son jarocho, both in Mexico and the U.S.

"If you become interested in son jarocho, you belong to a community almost right at the start," Figueroa says. "Of course, for us from Veracruz, it's important, but [also] for people from Mexico City, from California, like Chicanos, Anglos, whatever. They feel like they're participating, right from the start, in a community."

Libby Harding is the leader of a son jarocho group called Conjunto Jardin. When she was a child, she learned the music through her father, who learned it from the masters in Veracruz.

"I've always wanted to do it and share it with other people — share at least what I've learned and help maybe turn other people on to son jarocho by hearing us," Harding says. "Maybe they'd go and look at some of the roots of the music."

As long as son jarocho musicians learn and hold onto the roots of the music, the tradition will thrive wherever it's played.

SIMON: Son jarocho was born more than 500 years ago. Now its popularity is on the rise again, not only in Mexico but in the U.S. Betto Arcos has the story.

BETTO ARCOS: It's a warm evening at Tia Chucha's Bookstore in Sylmar, in the San Fernando Valley, not far from the neighborhood where Ritchie Valens created a rock 'n' roll version of son jarocho's most famous tune. Tonight, Aaron Castellanos is one of eight students in a music class held at the store. He's learning to play the eight-string jarana, son jarocho's main instrument.

AARON CASTELLANOS: I like the way that the jarana sounds. And I like the way how son jarocho invokes so much energy, into the playing and into the singing.

(SOUNDBITE OF MUSIC)

ARCOS: Castellanos is actually learning the mosquito, one of the smallest jaranas with a noticeably high pitch.

(SOUNDBITE OF MOSQUITO)

CASTELLANOS: This is the first instrument that I've ever learned, so I want to keep playing. I want to buy my own jarana and just, you know, continue practicing and see if I could grow into a more acquired player.

ARCOS: His teacher is Cesar Castro, a key figure at the center of the son jarocho explosion in Los Angeles. Castro says that since he moved to L.A., eight years ago from Veracruz, the number of son jarocho musicians has been growing and the quality of the music has been getting better.

CESAR CASTRO: When we had the first fandangos here in Los Angeles, the music was, it was you know, not that good. But the energy, the will to do these fandangos, it was very strong and that's strong, still strong, and the music is getting just better, still in a very respectful traditional format.

ARCOS: Fandangos are at the heart of son jarocho. They're kind of like jam sessions, where musicians gather to play, sing and dance around a wood platform called tarima.

(SOUNDBITE OF MUSIC)

CAMBALACHE: (Instrumental)

(SOUNDBITE OF CHEERING AND APPLAUSE)

ARCOS: At the Zona Rosa Cafe in Pasadena, the fandango is hosted by Castro's band Cambalache, one of a dozen son jarocho groups in the L.A. area.

ARCOS: Cesar Castro says that about 10 years ago, young Mexican-Americans got into son jarocho as a way to connect to their Mexican heritage.

CASTRO: And they felt more comfortable, more invited to participate. And doesn't matter if you don't dance, if you don't play, if you don't sing, just, you could be around it. And it's a whole experience that people, little by little, got the chance to be part of and felt something good. Who knows what, exactly what, but definitely you felt good, in order for you to go back and probably one day try to pick a jarana or try to start dancing.

ARCOS: One of the groups that grew out of this evolving scene is the primarily all-female "Son del Centro", an ensemble created at the Mexican Cultural Center in Santa Ana, the heart of the Mexican-American community in Orange County.

(SOUNDBITE OF MUSIC)

SON DEL CENTRO: (Sung in foreign language)

ARCOS: Ana Urzua sings, dances and plays with the group, as do all of the musicians. She says the music's ability to get everybody, musicians and audiences, to do everything is part of its appeal.

(SOUNDBITE OF WHISTLING AND APPLAUSE)

ANA URZUA: I think it's the music, it's a beautiful music, it's a music that is welcoming, but I think it's also that it is a part of something bigger; it's a part of a people and their traditions and their culture.

ARCOS: For the last 10 years, Los Angeles has been hosting a son jarocho festival. This year, Mono Blanco, the group that helped revive this music in the late 70s in Veracruz came to play in South L.A.

(SOUNDBITE OF MUSIC)

MONO BLANCO: (Sung in foreign language)

ARCOS: Gilberto Gutierrez, the group's leader, says the traditional way of playing son jarocho has not changed. What's new and exciting is how young Latinos in the U.S. have taken up the music.

(SOUNDBITE OF CHEERING, WHISTLES AND APPLAUSE)

GILBERTO GUTIERREZ: (Foreign language spoken)

UNIDENTIFIED MAN: The fandango celebration has the ability to bring together families, generations, different social classes, and that's really positive. Especially because these days different generations tend to separate, but now suddenly there's an activity that unites the family, youth, old, kids, rich or poor and so on. I think that's what's been attractive to people here in the U.S.

RAFAEL FIGUEROA: I think that's its main strength. Because, people, I think in these days, almost all modern societies need some kind of sense of belonging and son jarocho provides that.

ARCOS: Rafael Figueroa is a writer and radio host from Veracruz. He's been recording and documenting son jarocho both in Mexico and the U.S.

FIGUEROA: If you become interested in son jarocho, you belong to a community almost right at the start, and I think that's what makes son jarocho so appealing to everybody. I mean of course, for us from Veracruz, it's important, but from people from Mexico City from California; Chicanos, Anglos, whatever, they feel like they're participating right from the start in a community.

(SOUNDBITE OF MUSIC)

ARCOS: Libby Harding is the leader of a son jarocho group called Conjunto Jardin.

LIBBY HARDING: Son jarocho is so exciting. The energy that it has is infectious.

ARCOS: She started playing the music when she was a kid through her father, who learned the music from the masters in Veracruz.

HARDING: And so I've always wanted to do it and share it with other people, share at least what I've learned. And help maybe turn other people on to son jarocho by hearing us, maybe they'd go and look at some of the roots of the music.

ARCOS: And as long as son jarocho musicians learn and hold on to the roots of the music, the tradition will thrive wherever it's played. For NPR News, I'm Betto Arcos in Los Angeles.